Computer Systems Architecture
DLLM
Figure4.51.pdf
WB
M
EX
WB
M WB
M em
W rit
e
PCSrc
M em
to R
eg MemRead
Add
Address
Instruction memory
Read register 1
Read register 2
Instruction [15–0]
Instruction [20–16]
Instruction [15–11]
Write register Write data
Read data 1
Read data 2
Registers Address
Write data
Read data
Data memory
Add Add result
ALU ALU result
Zero
Shift left 2
Sign- extend
PC
4
ID/EX
IF/ID
EX/MEM
MEM/WB
16 632 ALU control
RegDst
ALUOp
ALUSrc
R eg
W rit
e
In st
ru ct
io n
Branch
Control
0 M u x
1
0 M u x
M u x
M u x
1
1
0
0
1
